If you want to start a discussion it is better to do more than give just a random list of years, any specific things that you don't think age does? Like affecting their voices, generally how much energy they have etc

I do think age plays a factor. You are talking about 1988 when the guys were in their mid-late twenties and were pretty much up for nothing but touring, up to 2003 when they were in their early-mid forties with families, big difference.